DIC/InStyle's Annual Diamond Fashion Show Preview

Kristen Prout and Garcelle Beauvais-Nilon

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Ashley Greene, Rachel Bilson and Minka Kelly

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Twilight Saga star Ashley Greene (in J. Mendel) and fellow actresses Rachel Bilson (in Chanel) and Minka Kelly (wearing Martin Katz diamond studs and Everlon rings) made a stylish trio at InStyle and Diamond Information Center's annual Awards Season Diamond Fashion Show Preview. The Beverly Hills Hotel luncheon offered guests a sneak peek at the latest trends in red carpet gowns and more than $65 million in jaw-dropping diamonds before Sunday's Golden Globes. Greene showed off her own yellow drop Bochic earrings. "These are gorgeous, right?" she said.

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Dianna Agron and Jenna Dewan

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"I had meetings and auditions all morning, so I wasn't sure I was going to make it here," said a breathless Jenna Dewan, before heading in to the Beverly Hills Hotel's Rodeo Ballroom. "But then someone handed me this gorgeous Paule Ka dress and some diamonds and here I am!" Glee's Dianna Agron (in a vintage lace dress) also had her breath taken away by the surroundings as well as the Martin Katz yellow diamond ring and Everlon Diamond Knot Collection earrings on loan to her for the day. "You can't help but be a little nervous!" she said.

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Rachel Bilson and InStyle Managing Editor Ariel Foxman

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"I think Marilyn Monroe said it best: Diamonds are a girl’s best friend," said Rachel Bilson when she helped InStyle editor Ariel Foxman and the Diamond Information Center host the 9th annual Awards Season Diamond Fashion Show Preview. The afternoon event was also the perfect opportunity for Bilson to unveil the Everlon Diamond Knot Collection bracelet she designed for the Diamond Empowerment Fund, a non-profit organization that provides education programs to kids in African countries.

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Lisa Edelstein and Jessica Gilsig

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After Glee's Jessica Gilsig shared hellos with House M.D.'s Lisa Edelstein (in a Pucci dress and wearing a Martin Katz diamond ring), we asked if her TV alter ego, Terri Shuester, will ever get a chance to sing on the show? "I hope so!" Gilsig (in BCBG) exclaimed. "I think she should try to win her husband back by serenading him with Taylor Swift's 'Love Story' dressed in full princess regalia. Because, let's face it, Terri thinks she is a princess."

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Olivia Wilde and Maria Bello

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Along with Golden Globes gowns and jewels, Olivia Wilde (in Alberta Ferretti) and Maria Bello's thoughts were with the earthquake victims in Haiti. Wilde, who visited the Caribbean island a few weeks ago, immediately tweeted about relief efforts. "We've already raised $34,000," she said. Bello (in Max Azria and her own jewelry) is also active through artistsforpeaceandjustice.com. "As we speak we are wiring money to help rescue the children," she told us.

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Mavis Spencer and Alfre Woodard

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Miss Golden Globe 2010 Mavis Spencer walked the red carpet like a pro with mother Alfre Woodard (both chose dresses by Alberta Ferretti and jewels from Erica Courtney for the occasion) by her side. "My gown for Sunday night just arrived today, but I haven't had a chance to look inside the bag," said Spencer of the custom Valentino creation she'll wear for her big night. "I have only ever been to one major awards show before so I'm really excited."

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Kristen Prout and Garcelle Beauvais-Nilon

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She may have just landed her first major movie role, but Eclipse star Kristen Prout fielded the pleas for plot spoilers about the latest Twilight Saga installment like a true Hollywood veteran. "I'm not going to give you any hints because my confidentiality agreement is serious," said the Canadian actress, posing here with Garcelle Beauvais-Nilon. "But I will say that I play one of the vampires that helps 'turn' Jackson Rathbone's character Jasper."

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DIC/InStyle's Annual Diamond Fashion Show Preview

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Ashley Greene, Rachel Bilson and Minka Kelly